WO2011142254A1 - Organic el light-emitting element - Google Patents

Organic el light-emitting element Download PDF

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WO2011142254A1
WO2011142254A1 PCT/JP2011/060153 JP2011060153W WO2011142254A1 WO 2011142254 A1 WO2011142254 A1 WO 2011142254A1 JP 2011060153 W JP2011060153 W JP 2011060153W WO 2011142254 A1 WO2011142254 A1 WO 2011142254A1
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layer
organic
electrode
light emitting
light
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French (fr)
Japanese (ja)
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浩二 宮脇
司 八木
耕一 石田
勇一 池津
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コニカミノルタホールディングス株式会社
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Publication of WO2011142254A1 publication Critical patent/WO2011142254A1/en

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/81—Anodes
    • H10K50/814—Anodes combined with auxiliary electrodes, e.g. ITO layer combined with metal lines
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/844—Encapsulations

Definitions

  • the present invention relates to an organic EL light emitting device.
  • organic EL light-emitting element Since the organic EL light-emitting element is a self-luminous material, it has many excellent features such as low driving voltage and low power consumption, high luminance, fast response, wide viewing angle, and thinning the element. is doing. For this reason, organic EL light-emitting elements have attracted attention as illumination devices that replace incandescent bulbs and fluorescent lamps, or as flat display devices that replace liquid crystal displays and plasma displays.
  • a pulse driving method as one of the methods of dimming in the organic EL light emitting device. If lighting and extinguishing are repeated at a cycle shorter than the reaction speed of the human eye, it is recognized as being continuously lit at an average luminance due to human illusion.
  • the pulse driving method by utilizing this characteristic, a period in which a pulsed driving voltage is applied to each organic EL light emitting element in a short cycle and a period in which the organic EL light emitting element is turned on and a period in which it is turned off without being applied are switched alternately. Dimming is performed by changing.
  • Patent Document 1 discloses an organic EL lighting device that covers a portion other than the light emitting surface of an organic panel with a separate conductive casing. Has been.
  • Patent Document 2 discloses an EL light emitting element in which a noise reduction electrode provided on the back side is grounded together with a transparent electrode for the same purpose.
  • the organic EL light emitting element is very sensitive to a substance that interferes with an electrochemical process from formation of excitons in the light emitting layer to light emission.
  • Representative of such materials are moisture and oxygen. If these substances exist as impurities or diffuse from the outside, the light emission efficiency and the drive life are remarkably shortened, and it becomes impossible to obtain practical illumination and display performance.
  • moisture, oxygen, etc. may change the electrical / chemical characteristics of the electrode surface and the inside, thereby obstructing the movement of electrons and holes, and as a result, the practical characteristics can be greatly deteriorated.
  • the first and second protective layers are provided so as to sandwich the noise reduction electrode in order to prevent moisture from the outside.
  • the EL light-emitting element disclosed in Patent Document 2 has a problem that noise reduction electrodes are merely provided on the back surface of the EL light-emitting element, and noise leakage from the side face cannot be prevented.
  • the entire organic EL light emitting element except for the light emitting surface is simply covered with a separate casing, and the gap between the organic EL light emitting element and the casing is covered.
  • the organic EL light emitting element communicates with the air through the gap, there is a problem that moisture and oxygen cannot be prevented from entering from the outside, and the practical characteristics of the organic EL light emitting element may be deteriorated.
  • it is set as the structure covered with a housing
  • an object of the present invention is to provide an organic EL light emitting device that has a simple configuration, suppresses leakage of generated noise, and has a sealing effect against moisture and oxygen.
  • An organic EL light emitting device includes a transparent support, a transparent first electrode provided on the transparent support, an organic layer including a light emitting layer provided on the first electrode, and light emission A second electrode provided on the organic layer including the layer; an insulating layer provided on the second electrode; and a conductive layer provided on the insulating layer.
  • the conductive layer is bonded to the first electrode and grounded together with the first electrode.
  • the organic layer including the light emitting layer is sealed with a transparent support and a conductive layer.
  • an organic EL light emitting device that has a simple configuration, suppresses noise leakage, and has a sealing effect against moisture and oxygen.
  • FIG. 2 is a schematic cross-sectional view along AA in FIG. 1.
  • FIG. 2 is a schematic cross-sectional view along BB in FIG. 1.
  • FIG. 1 is a schematic perspective view showing an organic EL light emitting device according to an embodiment of the present invention.
  • 2A and 2B are schematic cross-sectional views of the organic EL light emitting device. That is, FIGS. 2A and 2B are schematic cross-sectional views along AA and BB in FIG. 1, respectively.
  • the organic EL light-emitting element 1A will be described with reference to FIGS. 1, 2A, and 2B.
  • the organic EL light emitting device 1A includes a first electrode 102, an organic layer 104 including a light emitting layer, a second electrode 106, an insulating layer 107, a conductive layer 108, which are sequentially disposed on the transparent support 101. have.
  • the transparent support 101 is not limited to a specific material such as glass or resin, but is transparent (that is, a material that transmits light from the light emitting layer) and has a gas barrier property. That's fine.
  • the substrate preferably used for the transparent support 101 include glass, quartz, and a light transmissive resin film.
  • a material having sufficient gas barrier properties can be realized by itself.
  • a substrate preferably used for the transparent support 101 is a resin film that functions as a flexible member.
  • resin film an organic EL light emitting element having flexibility can be realized.
  • resin films include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polyetherimide (PEI), polyetheretherketone (PEEK), polyphenylene sulfide (PPS). , Polyarylate (PAR), polyimide (PI), polycarbonate (PC), cellulose triacetate (TAC), cellulose acetate propionate (CAP) and the like.
  • the transparent support 101 may be composed of only a resin film substrate.
  • the surface of the resin film is made of an inorganic coating, an organic coating, or a hybrid coating of an inorganic and an organic coating. It is particularly preferable to form a gas barrier layer.
  • the gas barrier property of the transparent support 101 using a resin film as a substrate it is preferable that the water vapor transmission rate is 0.01 g / m 2 ⁇ day ⁇ atm or less.
  • the transparent first electrode 102 formed on the transparent support 101 is made of ITO (Indium / Tin / Oxide) or IZO (Indium / Zinc / Iinc) having a thickness of about 100 nm, which is conductive and transmits light. Oxide) or the like. In the present embodiment, ITO having a thickness of 10 nm is used as the first electrode 102.
  • the organic layer 104 including a light-emitting layer has a thickness of about 100 nm and is sequentially stacked by vapor deposition, a hole injection layer (40 nm), a hole transport layer (20 nm), a light-emitting layer (30 nm), and a hole blocking layer (10 nm). And an electron transport layer (30 nm).
  • the organic layer 104 including the light emitting layer employs a structure including a hole injection layer (40 nm), a hole transport layer (20 nm), a light emitting layer (30 nm), and a hole blocking layer (10 nm). is doing.
  • the second electrode 106 is made of a thin film such as aluminum (Al) or silver (Ag) having a thickness of about 150 nm. In this embodiment, 150 nm aluminum is used.
  • the first electrode 102 is electrically connected to the anode side of the power source PS, and the second electrode 106 is electrically connected to the cathode side of the power source PS, whereby an organic layer including a light emitting layer is interposed through the first electrode 102. Holes are injected into 104, and electrons are injected into the organic layer 104 including the light emitting layer through the second electrode 106. As will be described later, since the first electrode 102 connected to the anode side is grounded, a negative drive voltage is applied to the second electrode 106 connected to the cathode side.
  • the organic layer 104 including the light-emitting layer In the organic layer 104 including the light-emitting layer, recombination of holes and electrons occurs, and a light-emitting phenomenon occurs when excitons generated along with the recombination shift from the excited state to the ground state. Then, the light L1 generated in the organic layer 104 including the light emitting layer passes through the first electrode 102 and the transparent support 101 and is irradiated to the outside.
  • the pulse is supplied from the power source PS at a cycle (for example, about several hundred Hz) faster than the reaction speed of the human eye.
  • Drive voltage is applied. Dimming is performed by changing the ratio by alternately switching between a period in which the voltage is applied and lighting, and a period in which the voltage is not applied and extinguishing by application of the driving voltage from the power source PS.
  • the conductive layer 108 is joined to the first electrode 102 at its end 108e. Both the conductive layer 108 and the transparent support 101 are grounded. The upper surface and the side surface of the second electrode 106 are covered with the conductive layer 108.
  • the lead-out portion 102a for connecting the first electrode 102 and the second electrode are provided for electrical connection with the power source PS.
  • the connection lead-out portion 106a 106 has a configuration in which each end portion is exposed to the outside.
  • the organic EL light emitting element 1A has a structure in which the first electrode 102 and the second electrode 106 face each other and the organic layer 104 including the light emitting layer is sandwiched between the transparent support 101 and the insulating layer 107. Further, the surrounding structure is sealed with the conductive layer 108 and the transparent support 101 so that the organic layer 104 including the light emitting layer is not exposed to the outside air. Note that the end portion 108e of the conductive layer 108 is bonded to the first electrode 102 as described above, and is also bonded to the transparent support 101.
  • the conductive layer 108 is formed of a metal material such as copper (Cu) or aluminum.
  • the protective layer 109 is not an essential component, but it is preferable to provide the protective layer 109 in order to improve scratch resistance.
  • a sheet in which a metal layer such as aluminum is vapor-deposited on a resin film substrate (10 to 200 ⁇ m) such as a PET (PolyEthylene Terephthalate) film can be used.
  • the resin film substrate corresponds to the protective layer 109
  • the metal layer corresponds to the conductive layer 108.
  • 30 ⁇ m aluminum is used as the conductive layer 108
  • a 50 ⁇ m PET film is used as the protective layer 109.
  • the organic layer 104 including a light emitting layer sealed by them can be shielded from moisture and oxygen. Accordingly, it is possible to prevent the performance of the organic layer 104 including the light emitting layer from being deteriorated.
  • the conductive layer 108 can be used as a sealing member having a gas barrier property and a noise removal layer, the number of components can be reduced and the manufacturing process can be simplified.
  • the gas barrier property of the conductive layer 108 it is preferable that the water vapor transmission rate is 0.01 g / m 2 ⁇ day ⁇ atm or less, like the transparent support 101.
  • the organic EL light emitting element 1A can be bent, and the organic EL light emitting element 1A can be used in a curved state, or the weight can be reduced. It is possible to plan.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

Disclosed is an organic EL light-emitting element comprising: a transparent support (101); a transparent first electrode (102) arranged on the transparent support; an organic layer (104) containing a light-emitting layer and arranged on the first electrode; a second electrode (106) arranged on the organic layer that contains the light-emitting layer; an insulating layer (107) arranged on the second electrode; and an electrically conductive layer (108) arranged on the insulating layer. The electrically conductive layer is bound to the first electrode and is grounded together with the first electrode. The organic layer containing the light-emitting layer is sealed with the transparent support and the electrically conductive layer.

Description

有機ＥＬ発光素子Organic EL light emitting device
　本発明は、有機ＥＬ発光素子に関する。 The present invention relates to an organic EL light emitting device.
　有機ＥＬ発光素子は、自発光体であるため、駆動電圧が低くかつ消費電力が少ない、輝度が高い、応答性が速い、視野角が広い、素子を薄型化できるといった多くの優れた特徴を有している。そのため、有機ＥＬ発光素子は、白熱電球や蛍光灯に代わる照明デバイスとして、あるいは、液晶ディスプレイやプラズマディスプレイに代わるフラットディスプレイデバイスとして注目されている。 Since the organic EL light-emitting element is a self-luminous material, it has many excellent features such as low driving voltage and low power consumption, high luminance, fast response, wide viewing angle, and thinning the element. is doing. For this reason, organic EL light-emitting elements have attracted attention as illumination devices that replace incandescent bulbs and fluorescent lamps, or as flat display devices that replace liquid crystal displays and plasma displays.
　有機ＥＬ発光素子において、調光を行う方法の一つとしてパルス駆動方式がある。人間の目の反応速度よりも短い周期で、点灯と消灯とを繰り返せば、人間の錯覚により平均の輝度で連続点灯しているように認識される。パルス駆動方式では、この特性を利用して、短い周期で各々の有機ＥＬ発光素子にパルス状の駆動電圧を印加して点灯する期間と、印加しないで消灯する期間とを交互に切り替え、その比率を変更することにより調光を行うものである。 There is a pulse driving method as one of the methods of dimming in the organic EL light emitting device. If lighting and extinguishing are repeated at a cycle shorter than the reaction speed of the human eye, it is recognized as being continuously lit at an average luminance due to human illusion. In the pulse driving method, by utilizing this characteristic, a period in which a pulsed driving voltage is applied to each organic EL light emitting element in a short cycle and a period in which the organic EL light emitting element is turned on and a period in which it is turned off without being applied are switched alternately. Dimming is performed by changing.
　このようなパルス状の駆動電圧を印加する際の電圧変動に伴い、電気的なノイズが生じる可能性がある。このようなノイズを低減するために、特開２００７－２２７５２３号公報（特許文献１）には、有機パネルの発光面を除く部分を別体の導電性の筐体で覆う有機ＥＬ照明装置が開示されている。特開２００４－１５８４５１号公報（特許文献２）には、同様の目的で背面側に設けたノイズ減少用電極を透明電極と共に共通接地させたＥＬ発光素子が開示されている。 ¡Electric noise may occur due to voltage fluctuations when applying such a pulsed drive voltage. In order to reduce such noise, Japanese Patent Application Laid-Open No. 2007-227523 (Patent Document 1) discloses an organic EL lighting device that covers a portion other than the light emitting surface of an organic panel with a separate conductive casing. Has been. Japanese Patent Application Laid-Open No. 2004-158451 (Patent Document 2) discloses an EL light emitting element in which a noise reduction electrode provided on the back side is grounded together with a transparent electrode for the same purpose.
　また、有機ＥＬ発光素子は、発光層中で励起子を形成して発光に至るまでの電気化学的なプロセスを妨害する物質に対して、非常に敏感である。このような物質の代表としては、水分および酸素がある。これらの物質が、不純物として存在したり、外界から拡散したりすると、発光の効率や駆動寿命が著しく短くなり、実用的な照明や表示のための性能を得ることができなくなる。また、水分や酸素等は、電極表面や内部の電気的／化学的な特性を変化させ、電子や正孔の移動を妨害する場合もあり、その結果、実用的な特性を大きく劣化させ得る。このような問題に対して、特許文献２に記載のＥＬ発光素子では、外部からの湿気を防ぐ目的でノイズ減少用の電極を挟むように第１および第２の保護層が設けられている。 Further, the organic EL light emitting element is very sensitive to a substance that interferes with an electrochemical process from formation of excitons in the light emitting layer to light emission. Representative of such materials are moisture and oxygen. If these substances exist as impurities or diffuse from the outside, the light emission efficiency and the drive life are remarkably shortened, and it becomes impossible to obtain practical illumination and display performance. In addition, moisture, oxygen, etc. may change the electrical / chemical characteristics of the electrode surface and the inside, thereby obstructing the movement of electrons and holes, and as a result, the practical characteristics can be greatly deteriorated. With respect to such a problem, in the EL light emitting element described in Patent Document 2, the first and second protective layers are provided so as to sandwich the noise reduction electrode in order to prevent moisture from the outside.
特開２００７－２２７５２３号公報JP 2007-227523 A 特開２００４－１５８４５１号公報JP 2004-158451 A
　しかしながら、特許文献２に開示されたＥＬ発光素子では、ノイズ減少用の電極をＥＬ発光素子の背面に設けたのみであり、側面からのノイズの漏れを防ぐことができないという課題があった。 However, the EL light-emitting element disclosed in Patent Document 2 has a problem that noise reduction electrodes are merely provided on the back surface of the EL light-emitting element, and noise leakage from the side face cannot be prevented.
　また、特許文献１に開示された有機ＥＬ照明装置では、有機ＥＬ発光素子の発光面を除く全体を別体の筐体で覆っているだけであり、有機ＥＬ発光素子と筐体との隙間からノイズの漏れを生じる可能性がある。さらに、その隙間によって有機ＥＬ発光素子が大気に連通するため、外界からの水分および酸素の進入を防止できず、有機ＥＬ発光素子の実用的な特性が劣化し得るという課題があった。さらに、有機ＥＬ発光素子とは別の筐体で覆う構成としているため、装置の部品点数が増え、装置全体も大きくなるという課題もある。 Moreover, in the organic EL lighting device disclosed in Patent Document 1, the entire organic EL light emitting element except for the light emitting surface is simply covered with a separate casing, and the gap between the organic EL light emitting element and the casing is covered. There is a possibility of noise leakage. Furthermore, since the organic EL light emitting element communicates with the air through the gap, there is a problem that moisture and oxygen cannot be prevented from entering from the outside, and the practical characteristics of the organic EL light emitting element may be deteriorated. Furthermore, since it is set as the structure covered with a housing | casing different from an organic EL light emitting element, there also exists a subject that the number of parts of an apparatus increases and the whole apparatus becomes large.
　本発明は上記問題に鑑み、簡単な構成で、発生するノイズの漏れを抑制し、かつ水分や酸素に対する封止効果を備えた有機ＥＬ発光素子を提供することを目的とする。 In view of the above problems, an object of the present invention is to provide an organic EL light emitting device that has a simple configuration, suppresses leakage of generated noise, and has a sealing effect against moisture and oxygen.
　本発明のある局面に係る有機ＥＬ発光素子は、透明支持体と、透明支持体上に設けられた透明な第１電極と、第１電極上に設けられた発光層を含む有機層と、発光層を含む有機層上に設けられた第２電極と、第２電極上に設けられた絶縁性層と、絶縁性層上に設けられた導電性層とを含む。導電性層は、第１電極と接合され、かつ、第１電極とともに接地されている。発光層を含む有機層は、透明支持体と導電性層とによって封止されている。 An organic EL light emitting device according to an aspect of the present invention includes a transparent support, a transparent first electrode provided on the transparent support, an organic layer including a light emitting layer provided on the first electrode, and light emission A second electrode provided on the organic layer including the layer; an insulating layer provided on the second electrode; and a conductive layer provided on the insulating layer. The conductive layer is bonded to the first electrode and grounded together with the first electrode. The organic layer including the light emitting layer is sealed with a transparent support and a conductive layer.
　本発明によれば、簡単な構成で、発生するノイズの漏れを抑制し、かつ水分や酸素に対する封止効果を備えた有機ＥＬ発光素子を実現できる。 According to the present invention, it is possible to realize an organic EL light emitting device that has a simple configuration, suppresses noise leakage, and has a sealing effect against moisture and oxygen.
本発明の実施の形態に係る有機ＥＬ発光素子を示す概略斜視図である。It is a schematic perspective view which shows the organic electroluminescent light emitting element concerning embodiment of this invention. 図１のＡ－Ａに沿った概略断面図である。FIG. 2 is a schematic cross-sectional view along AA in FIG. 1. 図１のＢ－Ｂに沿った概略断面図である。FIG. 2 is a schematic cross-sectional view along BB in FIG. 1.
　本発明のある実施の形態について説明するが、本発明は後述するような実施の形態に限られない。 Although an embodiment of the present invention will be described, the present invention is not limited to the embodiment described below.
　図１は、本発明の実施の形態に係る有機ＥＬ発光素子を示す概略斜視図である。図２Ａおよび図２Ｂは、有機ＥＬ発光素子の概略断面図を示す。すなわち、図２Ａおよび図２Ｂは、それぞれ図１のＡ－ＡおよびＢ－Ｂに沿った概略断面図である。 FIG. 1 is a schematic perspective view showing an organic EL light emitting device according to an embodiment of the present invention. 2A and 2B are schematic cross-sectional views of the organic EL light emitting device. That is, FIGS. 2A and 2B are schematic cross-sectional views along AA and BB in FIG. 1, respectively.
　図１、図２Ａおよび図２Ｂを参照して、有機ＥＬ発光素子１Ａについて説明する。有機ＥＬ発光素子１Ａは、透明支持体１０１上に順次配置された、第１電極１０２と、発光層を含む有機層１０４と、第２電極１０６と、絶縁性層１０７と、導電性層１０８とを有している。 The organic EL light-emitting element 1A will be described with reference to FIGS. 1, 2A, and 2B. The organic EL light emitting device 1A includes a first electrode 102, an organic layer 104 including a light emitting layer, a second electrode 106, an insulating layer 107, a conductive layer 108, which are sequentially disposed on the transparent support 101. have.
　透明支持体１０１としては、ガラスや樹脂といった特定の材料に制限されることなく、透明のもの（すなわち、発光層からの光を透過させるもの）であって、かつ、ガスバリア性を有するものであればよい。透明支持体１０１に好ましく用いられる基材の一例としては、ガラス、石英、光透過性の樹脂フィルムが挙げられる。なお、ガラスまたは石英を用いた場合には、それ単独で充分なガスバリア性を有するものを実現できる。 The transparent support 101 is not limited to a specific material such as glass or resin, but is transparent (that is, a material that transmits light from the light emitting layer) and has a gas barrier property. That's fine. Examples of the substrate preferably used for the transparent support 101 include glass, quartz, and a light transmissive resin film. In addition, when glass or quartz is used, a material having sufficient gas barrier properties can be realized by itself.
　透明支持体１０１に好ましく用いられる基材として特に好ましいものは、可撓性部材として機能する樹脂フィルムである。樹脂フィルムを用いることで、フレキシブル性を有する有機ＥＬ発光素子を実現できる。このような樹脂フィルムの一例としては、ポリエチレンテレフタレート（ＰＥＴ）、ポリエチレンナフタレート（ＰＥＮ）、ポリエーテルスルホン（ＰＥＳ）、ポリエーテルイミド（ＰＥＩ）、ポリエーテルエーテルケトン（ＰＥＥＫ）、ポリフェニレンスルフィド（ＰＰＳ）、ポリアリレート（ＰＡＲ）、ポリイミド（ＰＩ）、ポリカーボネート（ＰＣ）、セルローストリアセテート（ＴＡＣ）、セルロースアセテートプロピオネート（ＣＡＰ）等からなるフィルムが挙げられる。 Particularly preferred as a substrate preferably used for the transparent support 101 is a resin film that functions as a flexible member. By using the resin film, an organic EL light emitting element having flexibility can be realized. Examples of such resin films include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polyetherimide (PEI), polyetheretherketone (PEEK), polyphenylene sulfide (PPS). , Polyarylate (PAR), polyimide (PI), polycarbonate (PC), cellulose triacetate (TAC), cellulose acetate propionate (CAP) and the like.
　透明支持体１０１を樹脂フィルムの基材のみで構成してもよいが、ガスバリア性を向上させるために、樹脂フィルムの表面に、無機物の被膜、有機物の被膜、または無機物と有機物とのハイブリッド被膜からなるガスバリア層を形成することが特に好ましい。樹脂フィルムを基材に用いた透明支持体１０１のガスバリア性としては、水蒸気透過率が０．０１ｇ／ｍ２・ｄａｙ・ａｔｍ以下であることが好ましい。 The transparent support 101 may be composed of only a resin film substrate. However, in order to improve the gas barrier properties, the surface of the resin film is made of an inorganic coating, an organic coating, or a hybrid coating of an inorganic and an organic coating. It is particularly preferable to form a gas barrier layer. As the gas barrier property of the transparent support 101 using a resin film as a substrate, it is preferable that the water vapor transmission rate is 0.01 g / m 2 · day · atm or less.
　本実施の形態では、透明支持体１０１としてポリエチレンテレフタレートを用いた。透明支持体１０１上に形成された透明な第１電極１０２は、導電性を有し、かつ、光を透過させる、厚さ１００ｎｍ程度のＩＴＯ（Ｉｎｄｉｕｍ・Ｔｉｎ・Ｏｘｉｄｅ）またはＩＺＯ（Ｉｎｄｉｕｍ・Ｚｉｎｃ・Ｏｘｉｄｅ）等で構成されている。本実施の形態では、第１電極１０２として厚さ１０ｎｍのＩＴＯを用いた。 In this embodiment, polyethylene terephthalate was used as the transparent support 101. The transparent first electrode 102 formed on the transparent support 101 is made of ITO (Indium / Tin / Oxide) or IZO (Indium / Zinc / Iinc) having a thickness of about 100 nm, which is conductive and transmits light. Oxide) or the like. In the present embodiment, ITO having a thickness of 10 nm is used as the first electrode 102.
　発光層を含む有機層１０４は、厚さ１００ｎｍ程度で、蒸着により順次積層した、正孔注入層（４０ｎｍ）、正孔輸送層（２０ｎｍ）、発光層（３０ｎｍ）、正孔阻止層（１０ｎｍ）、および電子輸送層（３０ｎｍ）等を有している。本実施の形態では、発光層を含む有機層１０４は、正孔注入層（４０ｎｍ）、正孔輸送層（２０ｎｍ）、発光層（３０ｎｍ）、および正孔阻止層（１０ｎｍ）からなる構成を採用している。 The organic layer 104 including a light-emitting layer has a thickness of about 100 nm and is sequentially stacked by vapor deposition, a hole injection layer (40 nm), a hole transport layer (20 nm), a light-emitting layer (30 nm), and a hole blocking layer (10 nm). And an electron transport layer (30 nm). In the present embodiment, the organic layer 104 including the light emitting layer employs a structure including a hole injection layer (40 nm), a hole transport layer (20 nm), a light emitting layer (30 nm), and a hole blocking layer (10 nm). is doing.
　第２電極１０６は、厚さ１５０ｎｍ程度のアルミニウム（Ａｌ）または銀（Ａｇ）等の薄膜で構成されている。本実施の形態では、１５０ｎｍのアルミニウムを用いた。 The second electrode 106 is made of a thin film such as aluminum (Al) or silver (Ag) having a thickness of about 150 nm. In this embodiment, 150 nm aluminum is used.
　電源ＰＳの陽極側に第１電極１０２を電気的に接続し、電源ＰＳの陰極側に第２電極１０６を電気的に接続することにより、第１電極１０２を介して、発光層を含む有機層１０４に正孔が注入され、第２電極１０６を介して、発光層を含む有機層１０４に電子が注入される。なお、後述のように陽極側に接続される第１電極１０２は接地されているので、陰極側に接続される第２電極１０６に負極性の駆動電圧を印加している。 The first electrode 102 is electrically connected to the anode side of the power source PS, and the second electrode 106 is electrically connected to the cathode side of the power source PS, whereby an organic layer including a light emitting layer is interposed through the first electrode 102. Holes are injected into 104, and electrons are injected into the organic layer 104 including the light emitting layer through the second electrode 106. As will be described later, since the first electrode 102 connected to the anode side is grounded, a negative drive voltage is applied to the second electrode 106 connected to the cathode side.
　発光層を含む有機層１０４では、正孔と電子との再結合が生じ、これに伴って生成される励起子が励起状態から基底状態へ移行する際に発光現象が起こる。そして、発光層を含む有機層１０４で発生した光Ｌ１は、第１電極１０２および透明支持体１０１を透過して外部へ照射される。 In the organic layer 104 including the light-emitting layer, recombination of holes and electrons occurs, and a light-emitting phenomenon occurs when excitons generated along with the recombination shift from the excited state to the ground state. Then, the light L1 generated in the organic layer 104 including the light emitting layer passes through the first electrode 102 and the transparent support 101 and is irradiated to the outside.
　有機ＥＬ発光素子１Ａからの光Ｌ１の輝度の変更を行う場合、つまり調光を行う場合には、電源ＰＳから、人間の目の反応速度よりも速い周期（例えば、数百Ｈｚ程度）でパルス状の駆動電圧が印加される。電源ＰＳからの駆動電圧の印加によって、電圧が印加されて点灯する期間と、電圧が印加されず消灯する期間とを交互に切り替え、その比率を変更することにより調光を行う。 When the luminance of the light L1 from the organic EL light emitting element 1A is changed, that is, when dimming is performed, the pulse is supplied from the power source PS at a cycle (for example, about several hundred Hz) faster than the reaction speed of the human eye. Drive voltage is applied. Dimming is performed by changing the ratio by alternately switching between a period in which the voltage is applied and lighting, and a period in which the voltage is not applied and extinguishing by application of the driving voltage from the power source PS.
　図２Ａに示すように、透明支持体１０１上で、導電性層１０８は、その端部１０８ｅで第１電極１０２と接合されている。導電性層１０８および透明支持体１０１は、ともに接地されている。第２電極１０６は、その上面および側面が導電性層１０８に覆われている。このような構成とすることによって、有機ＥＬ発光素子１Ａを発光させる際にパルス状の駆動電圧を印加したことにより発生するノイズに関しては、有機ＥＬ発光素子１Ａからの漏れ出しを抑制することが可能となる。なお、本実施の形態では、図２Ｂに示すように有機ＥＬ発光素子１Ａの一部分では、電源ＰＳとの電気的な接続のために、第１電極１０２の接続用の引出部１０２ａおよび第２電極１０６の接続用の引出部１０６ａは、各々の端部が外部に露呈した構成となっている。 As shown in FIG. 2A, on the transparent support 101, the conductive layer 108 is joined to the first electrode 102 at its end 108e. Both the conductive layer 108 and the transparent support 101 are grounded. The upper surface and the side surface of the second electrode 106 are covered with the conductive layer 108. By adopting such a configuration, it is possible to suppress leakage from the organic EL light emitting element 1A with respect to noise generated by applying a pulsed driving voltage when the organic EL light emitting element 1A emits light. It becomes. In the present embodiment, as shown in FIG. 2B, in part of the organic EL light emitting element 1A, the lead-out portion 102a for connecting the first electrode 102 and the second electrode are provided for electrical connection with the power source PS. The connection lead-out portion 106a 106 has a configuration in which each end portion is exposed to the outside.
　有機ＥＬ発光素子１Ａでは、透明支持体１０１と絶縁性層１０７との間に、第１電極１０２および第２電極１０６が対向して発光層を含む有機層１０４を挟む構造となっている。さらに、発光層を含む有機層１０４が外気に触れることがないように、その周囲を導電性層１０８および透明支持体１０１により封止した封止構造となっている。なお、導電性層１０８の端部１０８ｅは、上述のように第１電極１０２と接合されているとともに、透明支持体１０１とも接合されている。 The organic EL light emitting element 1A has a structure in which the first electrode 102 and the second electrode 106 face each other and the organic layer 104 including the light emitting layer is sandwiched between the transparent support 101 and the insulating layer 107. Further, the surrounding structure is sealed with the conductive layer 108 and the transparent support 101 so that the organic layer 104 including the light emitting layer is not exposed to the outside air. Note that the end portion 108e of the conductive layer 108 is bonded to the first electrode 102 as described above, and is also bonded to the transparent support 101.
　導電性層１０８は、例えば、銅（Ｃｕ）、アルミニウム等の金属材料により形成される。保護層１０９は、必須の構成ではないが、設けた方が耐傷性を向上する上で好ましい。このような構成の例として、ＰＥＴ（ＰｏｌｙＥｔｈｙｌｅｎｅ　Ｔｅｒｅｐｈｔｈａｌａｔｅ）フィルム等の樹脂フィルム基材（１０～２００μｍ）にアルミ等の金属層を蒸着形成したシートを用いることができる。この場合には、樹脂フィルム基材が保護層１０９に、金属層が導電性層１０８にそれぞれ相当することになる。本実施の形態では、導電性層１０８として３０μｍのアルミニウムを用い、保護層１０９として、５０μｍのＰＥＴフィルムを用いた。 The conductive layer 108 is formed of a metal material such as copper (Cu) or aluminum. The protective layer 109 is not an essential component, but it is preferable to provide the protective layer 109 in order to improve scratch resistance. As an example of such a configuration, a sheet in which a metal layer such as aluminum is vapor-deposited on a resin film substrate (10 to 200 μm) such as a PET (PolyEthylene Terephthalate) film can be used. In this case, the resin film substrate corresponds to the protective layer 109, and the metal layer corresponds to the conductive layer 108. In this embodiment mode, 30 μm aluminum is used as the conductive layer 108, and a 50 μm PET film is used as the protective layer 109.
　導電性層１０８、または、導電性層１０８および保護層１０９が、ガスバリア性を有し、かつ、透明支持体１０１もガスバリア性を有することから、これらによって封止された発光層を含む有機層１０４は、水分や酸素から遮断することができる。これによって、発光層を含む有機層１０４の性能の劣化を防ぐことが可能となる。また、導電性層１０８を、ガスバリア性を有する封止部材およびノイズ除去層として用いることができるので部品点数を減少させて、製造工程の簡略化を図ることが可能となる。なお、導電性層１０８のガスバリア性としては、透明支持体１０１と同様に、水蒸気透過率が０．０１ｇ／ｍ２・ｄａｙ・ａｔｍ以下であることが好ましい。 Since the conductive layer 108 or the conductive layer 108 and the protective layer 109 have a gas barrier property, and the transparent support 101 also has a gas barrier property, the organic layer 104 including a light emitting layer sealed by them. Can be shielded from moisture and oxygen. Accordingly, it is possible to prevent the performance of the organic layer 104 including the light emitting layer from being deteriorated. In addition, since the conductive layer 108 can be used as a sealing member having a gas barrier property and a noise removal layer, the number of components can be reduced and the manufacturing process can be simplified. As for the gas barrier property of the conductive layer 108, it is preferable that the water vapor transmission rate is 0.01 g / m 2 · day · atm or less, like the transparent support 101.
　また、導電性層１０８および透明支持体１０１を可撓性部材により構成することによって、有機ＥＬ発光素子１Ａは折り曲げ可能となり、有機ＥＬ発光素子１Ａを曲面状態で使用することができたり、軽量化を図ったりすることが可能となる。 In addition, by configuring the conductive layer 108 and the transparent support 101 with a flexible member, the organic EL light emitting element 1A can be bent, and the organic EL light emitting element 1A can be used in a curved state, or the weight can be reduced. It is possible to plan.
　今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
　１０１　透明支持体、１０２　第１電極、１０４　発光層を含む有機層、１０６　第２電極、１０７　絶縁性層、１０８　導電性層、１０９　保護層。 101 transparent support, 102 first electrode, 104 organic layer including light emitting layer, 106 second electrode, 107 insulating layer, 108 conductive layer, 109 protective layer.

Claims (4)

  1. 　有機ＥＬ発光素子であって、
    　透明支持体（１０１）と、
    　前記透明支持体上に設けられた透明な第１電極（１０２）と、
    　前記第１電極上に設けられた発光層を含む有機層（１０４）と、
    　前記発光層を含む有機層上に設けられた第２電極（１０６）と、
    　前記第２電極上に設けられた絶縁性層（１０７）と、
    　前記絶縁性層上に設けられた導電性層（１０８）とを備え、
    　前記導電性層は、前記第１電極と接合され、かつ、前記第１電極とともに接地されており、
    　前記発光層を含む有機層は、前記透明支持体と前記導電性層とによって封止されている、有機ＥＬ発光素子。     An organic EL light emitting device,
    A transparent support (101);
    A transparent first electrode (102) provided on the transparent support;
    An organic layer (104) including a light emitting layer provided on the first electrode;
    A second electrode (106) provided on the organic layer including the light emitting layer;
    An insulating layer (107) provided on the second electrode;
    A conductive layer (108) provided on the insulating layer;
    The conductive layer is bonded to the first electrode and grounded together with the first electrode;
    The organic layer including the light emitting layer is an organic EL light emitting device sealed with the transparent support and the conductive layer.
  2. 　前記透明支持体および前記導電性層は、可撓性部材により構成されている、請求項１に記載の有機ＥＬ発光素子。 The organic EL light-emitting element according to claim 1, wherein the transparent support and the conductive layer are made of a flexible member.
  3. 　前記第２電極には負の電圧が印加される、請求項１または２に記載の有機ＥＬ発光素子。 The organic EL light emitting device according to claim 1 or 2, wherein a negative voltage is applied to the second electrode.
  4. 　前記導電性層上に設けられた保護層をさらに備える、請求項１または２に記載の有機ＥＬ発光素子。 The organic EL light-emitting element according to claim 1, further comprising a protective layer provided on the conductive layer.
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